🔧 Real-Time Industrial Networking on RK3576
This article explores how PREEMPT_RT and EtherCAT are implemented on the Forlinx OK3576 platform, enabling hard real-time communication for industrial control and automation systems.
👉 https://www.forlinx.net/industrial-news/igh-ethercat-preempt-rt-forlinx-ok3576-776.html
#ForlinxEmbedded #EtherCAT #PREEMPT_RT #IndustrialAutomation #RealTimeLinux #OK3576
A year ago I was experimenting with Debian netinst and live-build, trying to understand boot, init, and live systems.
Today BashCore is a set of minimalist Debian-based live ISOs (CLI/GUI, optional PREEMPT_RT).
In 2026 the focus shifts to Buildroot: reproducible systems, RT Linux, and minimal OS design for real workloads.
Happy New Year to everyone!
#Linux #Buildroot #Debian #PREEMPT_RT #RealTimeLinux #Embedded
🚀 Rock-solid Real-Time performance on Raspberry Pi 4!
Just stress-tested via SSH a custom #Buildroot (Kernel 6.12.61-v8 #PREEMPT_RT). Even with a massive memory hog running (stress-ng --vm 2 --vm-bytes 1G), the results are insane:
🔹 Avg Latency: 14µs
🔹 Max Latency: 42µs
🔹 Jitter: Virtually zero
This #RPi4 is now a deterministic beast. 🐧🛠️ 64-bit RT Linux at its best!
#Linux #RealTime #EmbeddedLinux #RaspberryPi #Kernel #Performance #SystemStability
Built a custom Raspberry Pi 4 RT OS using Buildroot.
Manually downloaded the Raspberry kernel (6.12.61) and PREEMPT_RT patch (6.12.57), applied locally and produced a bootable SD.
It works.
No GUI, CLI tools only, deterministic boot and real-time behavior.
Learning by doing 🤓
#Linux #Buildroot #RaspberryPi #PREEMPT_RT #RealTime #Embedded #NoGUI #CLI #Nerd
Запуск приложений в Linux c использованием политик планирования «реального» времени
В октябре 2025 года в Нижнем Новгороде на форуме "Промышленная автоматизация: переход на открытую АСУ ТП" с коллегами зашел интересный разговор о Linux с патчем реального времени. В разговоре затронули разные интересные моменты: работа через гипервизоры, выделения ядер и отличия от QNX. Договорились о том, что я напишу небольшой гайд, рассказывающий что и как можно сделать, чтобы оптимизировать время отклика. Отдельно отмечу, что задачу доказать, что Linux с патчем PREEMPT_RT является операционной системой жёсткого реального времени перед собой не ставлю. На мой взгляд, она такой не является, так сказать by designe, в отличие от тех же QNX , VxWorks и ThreadX.
Halfway point (24h) in the Atom N450 Real-Time endurance test! The tiny netbook is stable and deterministic under 100% CPU load.
Key Results:
✅ System stability confirmed (0.0% CPU usage for kworkers/rcu).
⏱️ Max Jitter remains extremely low after 20 hours: 174μs (microseconds).
This proves the PREEMPT_RT kernel is effectively managing the worst-case scenario!
Endurance test on a 2009 Atom N450 netbook! 🛠️
This Acer Aspire One always failed on standard Linux due to a frustrating #kworker CPU spike, making it unusable. We're challenging that with #BashCoreZ_RT for 48 hours.
Goal: Prove our extreme #PREEMPT_RT optimization can permanently eliminate this hardware bug and revive the PC. Superior software rescues vintage hardware. Wish us stability! 🤞
#LinuxRT #KworkerFix #VintageTech #LowLatency
The **BashCoreZ RT** supremacy continues! We just tamed a 2009 Intel Atom N450 netbook (2GB RAM).
MAX Jitter hit an impressive **112µs** (-t1). The difference when scaling to 16 threads (-t16) was only 42µs!
This confirms it: our zero-bloat #PREEMPT_RT architecture minimizes scheduling overhead on even the weakest legacy CPUs.
We're bringing guaranteed #RealTime performance to obsolete hardware. BashCoreZ RT makes ancient PCs viable again. Zero excuses. 👑
Checkmate. The final #BashCoreZ #PREEMPT_RT test is in:
On a budget 2-core Celeron N4500 laptop (250€), Max Jitter hit an insane **39µs** after isolating network noise!
This proves it: Hardware specs count for little. The clean, zero-bloat kernel is EVERYTHING. We're delivering near Hard Real-Time performance with minimal cost.
29µs on i7 vs. 39µs on Celeron? The difference is negligible. BashCoreZ RT is the definitive, free Real-Time solution. 👑
We didn't just win; we dominated. The ultimate #BashCoreZ #PREEMPT_RT test results are here.
On a clean, budget MSI i7 laptop (500€!), Max Jitter hit an insane **29µs**! That's the true potential of our "zero bloat" kernel 6.12 base.
(Context: Our previous "worst-case scenario" test, with some apps running, capped at only 239µs. Competitors struggle to hit that clean!)
BashCoreZ delivers Hard Real-Time performance without the huge price tag. Get building. 👊🏻
BashCoreZ just proved it's the ultimate Real-Time base! 🚀
Tested the ultra-minimal #BashCoreZ (Debian 13 + Kernel 6.12 #PREEMPT_RT) using #cyclictest, remotely piloted from a #BashLabOS host.
Result: Max Jitter stayed under 240µs! That’s incredible determinism for embedded, robotics, and industrial control.
The "zero bloat" foundation truly eliminates noise.
2/ Side note for users of #Fedora #Linux:
#LinuxKernel 6.12 is now available for all Fedora releases in the "stable" #copr of my #kernel vanilla repositories.
For install instructions, see https://copr.fedorainfracloud.org/coprs/g/kernel-vanilla/stable/ and https://fedoraproject.org/wiki/Kernel_Vanilla_Repositories
In addition to the regular kernel package that copr as of today started shipping a dedicated #realtime kernel which has #PREEMPT_RT enabled. Install it by running:
$ sudo dnf install kernel-rt
2/ #realtime / -rt / #PREEMPT_RT #kernel packages for #Linux-next are now available as well: https://copr.fedorainfracloud.org/coprs/g/kernel-vanilla/next/build/8149928/
Side note: instead of 2 to 3 hours the daily builds now take 3 to 6. 😕
But whatever. 😀
🥳 My #kernel vanilla repositories for #Fedora #Linux[1] started shipping[2] kernels with #realtime aka #PREEMPT_RT support. 🥳
[1] https://fedoraproject.org/wiki/Kernel_Vanilla_Repositories
[2] 6.12-pre and later only obviously, as the latest stable series does not support it out-of-the-box
リアルタイムLinuxをあきらめない ―20年越しでメインラインに統合されたPREEMPT_RTの物語
https://gihyo.jp/article/2024/10/daily-linux-241016?utm_source=feed
With the new #PREEMPT_RT #linux kernel hitting mainline I wrote an article on the importance of kernel parameter tuning to reduce latency and jitter for #LinuxCNC
https://dantalion.nl/2024/09/29/linuxcnc-latency-jitter-kernel-parameter-tuning.html
#Linux v6.12-rc1-rt1 is out:
https://lore.kernel.org/all/20240930154216.ua_fDZt4@linutronix.de/
If you wonder what's still in the RT-Tree now that #PREEMPT_RT support is upstream, checkout https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/log/?h=linux-6.12.y-rt
In short: about 40 patches that among others switch 8250 to nbcon console, add support for ARM and PowerPC, or fix some drivers (like i915).
#Linux 6.12-rc1 is out:
https://lore.kernel.org/lkml/CAHk-=wiwVOCZsC6a4dLdb1UjL2fS_CnLNjrPL0XGFbDd9C26Cg@mail.gmail.com/
'"Despite conference travel (both for me and several maintainers), things seemed to go mostly fairly normally. There's a couple of notable new features in here: For one thing, #PREEMPT_RT is now mainlined and enabled as a config option (you do need to enable "EXPERT" to get the question). For another, #sched_ext also got merged.
[…]
Let's get the testing and calming down period started, ok?
Linus"'
Linux 的 RT (Real-Time) 版本 PREEMPT_RT
在 Hacker News Daily 上看到的，Linux kernel 把 PREEMPT_RT 這個 RT patch 併入 official repository 了：「Real-time Linux is officially part of the kernel after decades of debate」。
這類需求可以在 RTOS 裡面看到完整的說明，大家常用的特性是確保反應時間這點，像是對汽車自動
#Computer #Linux #Murmuring #OS #Software #atomic #kernel #linux #output #patch #preempt_rt #printk #realtime #realtime
